A Retardast is when your to stupid to be called a retard, whne your retardas or "retardastic" your the type of person who struggle to find out the diffrence between right and left or the type of guy who thinks Adolf Hitler was'nt not wrong.
When your retardast you struggle to find your phone when its right there in your fucking had god dammit!!
John:Hey Billy can you give me a hand?
Billy: Sorry John im running short, i only have two left, hahahahailushdflahsdfkuhalfhsuidfh (killyourself)
John: (Whispers ) you fucking retardast
it's a person who is just acting stupid. They act so stupid that it's funny. You calling someone this makes what you were laughing at even more funny. (NOT MEANT TO USE IN A SERIOUS MANNER)
''HAHAHA, oh my goodness that is so funny imma go get some more food''
''Okay.....''
**KNOCKS OVER BAG OF PRETZELS**
''HAHAHAHAHAHA did you just knock over the pretzels you retarded clump of gas HAHAH.''
**EVERYBODY STARTS LAUGHING**